forked from OSchip/llvm-project
Remove svn:eol-style property from 2 files.
There are still over 3400 files remaining with this property set, but there are tens of thousands more with the property not set. Until we decide what to do on a global scale, this at least unblocks me temporarily. llvm-svn: 295756
This commit is contained in:
Zachary Turner
parent
b2e6811ec1
commit
3788818730
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@ -1,183 +1,183 @@
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//===--- MemoryBuffer.h - Memory Buffer Interface ---------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the MemoryBuffer interface.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_MEMORYBUFFER_H
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#define LLVM_SUPPORT_MEMORYBUFFER_H
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/CBindingWrapping.h"
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#include "llvm/Support/ErrorOr.h"
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#include "llvm-c/Types.h"
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#include <memory>
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#include <cstddef>
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#include <cstdint>
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namespace llvm {
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class MemoryBufferRef;
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/// This interface provides simple read-only access to a block of memory, and
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/// provides simple methods for reading files and standard input into a memory
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/// buffer. In addition to basic access to the characters in the file, this
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/// interface guarantees you can read one character past the end of the file,
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/// and that this character will read as '\0'.
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///
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/// The '\0' guarantee is needed to support an optimization -- it's intended to
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/// be more efficient for clients which are reading all the data to stop
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/// reading when they encounter a '\0' than to continually check the file
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/// position to see if it has reached the end of the file.
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class MemoryBuffer {
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const char *BufferStart; // Start of the buffer.
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const char *BufferEnd; // End of the buffer.
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protected:
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MemoryBuffer() = default;
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void init(const char *BufStart, const char *BufEnd,
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bool RequiresNullTerminator);
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public:
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MemoryBuffer(const MemoryBuffer &) = delete;
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MemoryBuffer &operator=(const MemoryBuffer &) = delete;
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virtual ~MemoryBuffer();
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const char *getBufferStart() const { return BufferStart; }
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const char *getBufferEnd() const { return BufferEnd; }
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size_t getBufferSize() const { return BufferEnd-BufferStart; }
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StringRef getBuffer() const {
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return StringRef(BufferStart, getBufferSize());
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}
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/// Return an identifier for this buffer, typically the filename it was read
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/// from.
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virtual StringRef getBufferIdentifier() const { return "Unknown buffer"; }
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/// Open the specified file as a MemoryBuffer, returning a new MemoryBuffer
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/// if successful, otherwise returning null. If FileSize is specified, this
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/// means that the client knows that the file exists and that it has the
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/// specified size.
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///
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/// \param IsVolatileSize Set to true to indicate that the file size may be
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/// changing, e.g. when libclang tries to parse while the user is
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/// editing/updating the file.
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static ErrorOr<std::unique_ptr<MemoryBuffer>>
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getFile(const Twine &Filename, int64_t FileSize = -1,
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bool RequiresNullTerminator = true, bool IsVolatileSize = false);
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/// Read all of the specified file into a MemoryBuffer as a stream
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/// (i.e. until EOF reached). This is useful for special files that
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/// look like a regular file but have 0 size (e.g. /proc/cpuinfo on Linux).
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static ErrorOr<std::unique_ptr<MemoryBuffer>>
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getFileAsStream(const Twine &Filename);
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/// Given an already-open file descriptor, map some slice of it into a
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/// MemoryBuffer. The slice is specified by an \p Offset and \p MapSize.
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/// Since this is in the middle of a file, the buffer is not null terminated.
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static ErrorOr<std::unique_ptr<MemoryBuffer>>
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getOpenFileSlice(int FD, const Twine &Filename, uint64_t MapSize,
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int64_t Offset);
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/// Given an already-open file descriptor, read the file and return a
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/// MemoryBuffer.
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///
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/// \param IsVolatileSize Set to true to indicate that the file size may be
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/// changing, e.g. when libclang tries to parse while the user is
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/// editing/updating the file.
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static ErrorOr<std::unique_ptr<MemoryBuffer>>
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getOpenFile(int FD, const Twine &Filename, uint64_t FileSize,
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bool RequiresNullTerminator = true, bool IsVolatileSize = false);
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/// Open the specified memory range as a MemoryBuffer. Note that InputData
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/// must be null terminated if RequiresNullTerminator is true.
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static std::unique_ptr<MemoryBuffer>
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getMemBuffer(StringRef InputData, StringRef BufferName = "",
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bool RequiresNullTerminator = true);
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static std::unique_ptr<MemoryBuffer>
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getMemBuffer(MemoryBufferRef Ref, bool RequiresNullTerminator = true);
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/// Open the specified memory range as a MemoryBuffer, copying the contents
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/// and taking ownership of it. InputData does not have to be null terminated.
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static std::unique_ptr<MemoryBuffer>
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getMemBufferCopy(StringRef InputData, const Twine &BufferName = "");
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/// Allocate a new zero-initialized MemoryBuffer of the specified size. Note
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/// that the caller need not initialize the memory allocated by this method.
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/// The memory is owned by the MemoryBuffer object.
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static std::unique_ptr<MemoryBuffer>
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getNewMemBuffer(size_t Size, StringRef BufferName = "");
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/// Allocate a new MemoryBuffer of the specified size that is not initialized.
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/// Note that the caller should initialize the memory allocated by this
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/// method. The memory is owned by the MemoryBuffer object.
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static std::unique_ptr<MemoryBuffer>
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getNewUninitMemBuffer(size_t Size, const Twine &BufferName = "");
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/// Read all of stdin into a file buffer, and return it.
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static ErrorOr<std::unique_ptr<MemoryBuffer>> getSTDIN();
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/// Open the specified file as a MemoryBuffer, or open stdin if the Filename
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/// is "-".
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static ErrorOr<std::unique_ptr<MemoryBuffer>>
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getFileOrSTDIN(const Twine &Filename, int64_t FileSize = -1,
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bool RequiresNullTerminator = true);
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/// Map a subrange of the specified file as a MemoryBuffer.
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static ErrorOr<std::unique_ptr<MemoryBuffer>>
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getFileSlice(const Twine &Filename, uint64_t MapSize, uint64_t Offset);
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//===--------------------------------------------------------------------===//
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// Provided for performance analysis.
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//===--------------------------------------------------------------------===//
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/// The kind of memory backing used to support the MemoryBuffer.
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enum BufferKind {
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MemoryBuffer_Malloc,
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MemoryBuffer_MMap
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};
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/// Return information on the memory mechanism used to support the
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/// MemoryBuffer.
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virtual BufferKind getBufferKind() const = 0;
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MemoryBufferRef getMemBufferRef() const;
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};
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class MemoryBufferRef {
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StringRef Buffer;
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StringRef Identifier;
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public:
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MemoryBufferRef() = default;
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MemoryBufferRef(MemoryBuffer& Buffer)
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: Buffer(Buffer.getBuffer()), Identifier(Buffer.getBufferIdentifier()) {}
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MemoryBufferRef(StringRef Buffer, StringRef Identifier)
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: Buffer(Buffer), Identifier(Identifier) {}
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StringRef getBuffer() const { return Buffer; }
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StringRef getBufferIdentifier() const { return Identifier; }
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const char *getBufferStart() const { return Buffer.begin(); }
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const char *getBufferEnd() const { return Buffer.end(); }
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size_t getBufferSize() const { return Buffer.size(); }
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};
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// Create wrappers for C Binding types (see CBindingWrapping.h).
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DEFINE_SIMPLE_CONVERSION_FUNCTIONS(MemoryBuffer, LLVMMemoryBufferRef)
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} // end namespace llvm
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#endif // LLVM_SUPPORT_MEMORYBUFFER_H
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//===--- MemoryBuffer.h - Memory Buffer Interface ---------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the MemoryBuffer interface.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_MEMORYBUFFER_H
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#define LLVM_SUPPORT_MEMORYBUFFER_H
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/CBindingWrapping.h"
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#include "llvm/Support/ErrorOr.h"
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#include "llvm-c/Types.h"
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#include <memory>
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#include <cstddef>
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#include <cstdint>
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namespace llvm {
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class MemoryBufferRef;
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/// This interface provides simple read-only access to a block of memory, and
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/// provides simple methods for reading files and standard input into a memory
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/// buffer. In addition to basic access to the characters in the file, this
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/// interface guarantees you can read one character past the end of the file,
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/// and that this character will read as '\0'.
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///
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/// The '\0' guarantee is needed to support an optimization -- it's intended to
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/// be more efficient for clients which are reading all the data to stop
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/// reading when they encounter a '\0' than to continually check the file
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/// position to see if it has reached the end of the file.
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class MemoryBuffer {
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const char *BufferStart; // Start of the buffer.
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const char *BufferEnd; // End of the buffer.
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protected:
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MemoryBuffer() = default;
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void init(const char *BufStart, const char *BufEnd,
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bool RequiresNullTerminator);
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public:
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MemoryBuffer(const MemoryBuffer &) = delete;
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MemoryBuffer &operator=(const MemoryBuffer &) = delete;
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virtual ~MemoryBuffer();
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const char *getBufferStart() const { return BufferStart; }
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const char *getBufferEnd() const { return BufferEnd; }
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size_t getBufferSize() const { return BufferEnd-BufferStart; }
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StringRef getBuffer() const {
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return StringRef(BufferStart, getBufferSize());
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}
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/// Return an identifier for this buffer, typically the filename it was read
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/// from.
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virtual StringRef getBufferIdentifier() const { return "Unknown buffer"; }
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/// Open the specified file as a MemoryBuffer, returning a new MemoryBuffer
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/// if successful, otherwise returning null. If FileSize is specified, this
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/// means that the client knows that the file exists and that it has the
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/// specified size.
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///
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/// \param IsVolatileSize Set to true to indicate that the file size may be
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/// changing, e.g. when libclang tries to parse while the user is
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/// editing/updating the file.
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static ErrorOr<std::unique_ptr<MemoryBuffer>>
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getFile(const Twine &Filename, int64_t FileSize = -1,
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bool RequiresNullTerminator = true, bool IsVolatileSize = false);
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/// Read all of the specified file into a MemoryBuffer as a stream
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/// (i.e. until EOF reached). This is useful for special files that
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/// look like a regular file but have 0 size (e.g. /proc/cpuinfo on Linux).
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static ErrorOr<std::unique_ptr<MemoryBuffer>>
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getFileAsStream(const Twine &Filename);
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/// Given an already-open file descriptor, map some slice of it into a
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/// MemoryBuffer. The slice is specified by an \p Offset and \p MapSize.
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/// Since this is in the middle of a file, the buffer is not null terminated.
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static ErrorOr<std::unique_ptr<MemoryBuffer>>
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getOpenFileSlice(int FD, const Twine &Filename, uint64_t MapSize,
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int64_t Offset);
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/// Given an already-open file descriptor, read the file and return a
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/// MemoryBuffer.
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///
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/// \param IsVolatileSize Set to true to indicate that the file size may be
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/// changing, e.g. when libclang tries to parse while the user is
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/// editing/updating the file.
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static ErrorOr<std::unique_ptr<MemoryBuffer>>
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getOpenFile(int FD, const Twine &Filename, uint64_t FileSize,
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bool RequiresNullTerminator = true, bool IsVolatileSize = false);
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/// Open the specified memory range as a MemoryBuffer. Note that InputData
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/// must be null terminated if RequiresNullTerminator is true.
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static std::unique_ptr<MemoryBuffer>
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getMemBuffer(StringRef InputData, StringRef BufferName = "",
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bool RequiresNullTerminator = true);
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static std::unique_ptr<MemoryBuffer>
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getMemBuffer(MemoryBufferRef Ref, bool RequiresNullTerminator = true);
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/// Open the specified memory range as a MemoryBuffer, copying the contents
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/// and taking ownership of it. InputData does not have to be null terminated.
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static std::unique_ptr<MemoryBuffer>
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getMemBufferCopy(StringRef InputData, const Twine &BufferName = "");
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/// Allocate a new zero-initialized MemoryBuffer of the specified size. Note
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/// that the caller need not initialize the memory allocated by this method.
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/// The memory is owned by the MemoryBuffer object.
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static std::unique_ptr<MemoryBuffer>
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getNewMemBuffer(size_t Size, StringRef BufferName = "");
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/// Allocate a new MemoryBuffer of the specified size that is not initialized.
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/// Note that the caller should initialize the memory allocated by this
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/// method. The memory is owned by the MemoryBuffer object.
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static std::unique_ptr<MemoryBuffer>
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getNewUninitMemBuffer(size_t Size, const Twine &BufferName = "");
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/// Read all of stdin into a file buffer, and return it.
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static ErrorOr<std::unique_ptr<MemoryBuffer>> getSTDIN();
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/// Open the specified file as a MemoryBuffer, or open stdin if the Filename
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/// is "-".
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static ErrorOr<std::unique_ptr<MemoryBuffer>>
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getFileOrSTDIN(const Twine &Filename, int64_t FileSize = -1,
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bool RequiresNullTerminator = true);
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/// Map a subrange of the specified file as a MemoryBuffer.
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static ErrorOr<std::unique_ptr<MemoryBuffer>>
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getFileSlice(const Twine &Filename, uint64_t MapSize, uint64_t Offset);
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//===--------------------------------------------------------------------===//
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// Provided for performance analysis.
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//===--------------------------------------------------------------------===//
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/// The kind of memory backing used to support the MemoryBuffer.
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enum BufferKind {
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MemoryBuffer_Malloc,
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MemoryBuffer_MMap
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};
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/// Return information on the memory mechanism used to support the
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/// MemoryBuffer.
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virtual BufferKind getBufferKind() const = 0;
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MemoryBufferRef getMemBufferRef() const;
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};
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class MemoryBufferRef {
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StringRef Buffer;
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StringRef Identifier;
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public:
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MemoryBufferRef() = default;
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MemoryBufferRef(MemoryBuffer& Buffer)
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: Buffer(Buffer.getBuffer()), Identifier(Buffer.getBufferIdentifier()) {}
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MemoryBufferRef(StringRef Buffer, StringRef Identifier)
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: Buffer(Buffer), Identifier(Identifier) {}
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StringRef getBuffer() const { return Buffer; }
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StringRef getBufferIdentifier() const { return Identifier; }
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const char *getBufferStart() const { return Buffer.begin(); }
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const char *getBufferEnd() const { return Buffer.end(); }
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size_t getBufferSize() const { return Buffer.size(); }
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};
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// Create wrappers for C Binding types (see CBindingWrapping.h).
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DEFINE_SIMPLE_CONVERSION_FUNCTIONS(MemoryBuffer, LLVMMemoryBufferRef)
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} // end namespace llvm
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#endif // LLVM_SUPPORT_MEMORYBUFFER_H
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@ -1,457 +1,457 @@
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//===--- MemoryBuffer.cpp - Memory Buffer implementation ------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
|
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// License. See LICENSE.TXT for details.
|
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the MemoryBuffer interface.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Config/config.h"
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#include "llvm/Support/Errc.h"
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#include "llvm/Support/Errno.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/Process.h"
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#include "llvm/Support/Program.h"
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#include <cassert>
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#include <cerrno>
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#include <cstring>
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#include <new>
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#include <sys/types.h>
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#include <system_error>
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#if !defined(_MSC_VER) && !defined(__MINGW32__)
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#include <unistd.h>
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#else
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#include <io.h>
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#endif
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// MemoryBuffer implementation itself.
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//===----------------------------------------------------------------------===//
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MemoryBuffer::~MemoryBuffer() { }
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/// init - Initialize this MemoryBuffer as a reference to externally allocated
|
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/// memory, memory that we know is already null terminated.
|
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void MemoryBuffer::init(const char *BufStart, const char *BufEnd,
|
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bool RequiresNullTerminator) {
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assert((!RequiresNullTerminator || BufEnd[0] == 0) &&
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"Buffer is not null terminated!");
|
||||
BufferStart = BufStart;
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BufferEnd = BufEnd;
|
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}
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//===----------------------------------------------------------------------===//
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// MemoryBufferMem implementation.
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//===----------------------------------------------------------------------===//
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||||
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/// CopyStringRef - Copies contents of a StringRef into a block of memory and
|
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/// null-terminates it.
|
||||
static void CopyStringRef(char *Memory, StringRef Data) {
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||||
if (!Data.empty())
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memcpy(Memory, Data.data(), Data.size());
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Memory[Data.size()] = 0; // Null terminate string.
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}
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namespace {
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struct NamedBufferAlloc {
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||||
const Twine &Name;
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NamedBufferAlloc(const Twine &Name) : Name(Name) {}
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};
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}
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||||
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||||
void *operator new(size_t N, const NamedBufferAlloc &Alloc) {
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||||
SmallString<256> NameBuf;
|
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StringRef NameRef = Alloc.Name.toStringRef(NameBuf);
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||||
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||||
char *Mem = static_cast<char *>(operator new(N + NameRef.size() + 1));
|
||||
CopyStringRef(Mem + N, NameRef);
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return Mem;
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||||
}
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namespace {
|
||||
/// MemoryBufferMem - Named MemoryBuffer pointing to a block of memory.
|
||||
class MemoryBufferMem : public MemoryBuffer {
|
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public:
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MemoryBufferMem(StringRef InputData, bool RequiresNullTerminator) {
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||||
init(InputData.begin(), InputData.end(), RequiresNullTerminator);
|
||||
}
|
||||
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||||
/// Disable sized deallocation for MemoryBufferMem, because it has
|
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/// tail-allocated data.
|
||||
void operator delete(void *p) { ::operator delete(p); }
|
||||
|
||||
StringRef getBufferIdentifier() const override {
|
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// The name is stored after the class itself.
|
||||
return StringRef(reinterpret_cast<const char *>(this + 1));
|
||||
}
|
||||
|
||||
BufferKind getBufferKind() const override {
|
||||
return MemoryBuffer_Malloc;
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
static ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
getFileAux(const Twine &Filename, int64_t FileSize, uint64_t MapSize,
|
||||
uint64_t Offset, bool RequiresNullTerminator, bool IsVolatileSize);
|
||||
|
||||
std::unique_ptr<MemoryBuffer>
|
||||
MemoryBuffer::getMemBuffer(StringRef InputData, StringRef BufferName,
|
||||
bool RequiresNullTerminator) {
|
||||
auto *Ret = new (NamedBufferAlloc(BufferName))
|
||||
MemoryBufferMem(InputData, RequiresNullTerminator);
|
||||
return std::unique_ptr<MemoryBuffer>(Ret);
|
||||
}
|
||||
|
||||
std::unique_ptr<MemoryBuffer>
|
||||
MemoryBuffer::getMemBuffer(MemoryBufferRef Ref, bool RequiresNullTerminator) {
|
||||
return std::unique_ptr<MemoryBuffer>(getMemBuffer(
|
||||
Ref.getBuffer(), Ref.getBufferIdentifier(), RequiresNullTerminator));
|
||||
}
|
||||
|
||||
std::unique_ptr<MemoryBuffer>
|
||||
MemoryBuffer::getMemBufferCopy(StringRef InputData, const Twine &BufferName) {
|
||||
std::unique_ptr<MemoryBuffer> Buf =
|
||||
getNewUninitMemBuffer(InputData.size(), BufferName);
|
||||
if (!Buf)
|
||||
return nullptr;
|
||||
memcpy(const_cast<char*>(Buf->getBufferStart()), InputData.data(),
|
||||
InputData.size());
|
||||
return Buf;
|
||||
}
|
||||
|
||||
std::unique_ptr<MemoryBuffer>
|
||||
MemoryBuffer::getNewUninitMemBuffer(size_t Size, const Twine &BufferName) {
|
||||
// Allocate space for the MemoryBuffer, the data and the name. It is important
|
||||
// that MemoryBuffer and data are aligned so PointerIntPair works with them.
|
||||
// TODO: Is 16-byte alignment enough? We copy small object files with large
|
||||
// alignment expectations into this buffer.
|
||||
SmallString<256> NameBuf;
|
||||
StringRef NameRef = BufferName.toStringRef(NameBuf);
|
||||
size_t AlignedStringLen =
|
||||
alignTo(sizeof(MemoryBufferMem) + NameRef.size() + 1, 16);
|
||||
size_t RealLen = AlignedStringLen + Size + 1;
|
||||
char *Mem = static_cast<char*>(operator new(RealLen, std::nothrow));
|
||||
if (!Mem)
|
||||
return nullptr;
|
||||
|
||||
// The name is stored after the class itself.
|
||||
CopyStringRef(Mem + sizeof(MemoryBufferMem), NameRef);
|
||||
|
||||
// The buffer begins after the name and must be aligned.
|
||||
char *Buf = Mem + AlignedStringLen;
|
||||
Buf[Size] = 0; // Null terminate buffer.
|
||||
|
||||
auto *Ret = new (Mem) MemoryBufferMem(StringRef(Buf, Size), true);
|
||||
return std::unique_ptr<MemoryBuffer>(Ret);
|
||||
}
|
||||
|
||||
std::unique_ptr<MemoryBuffer>
|
||||
MemoryBuffer::getNewMemBuffer(size_t Size, StringRef BufferName) {
|
||||
std::unique_ptr<MemoryBuffer> SB = getNewUninitMemBuffer(Size, BufferName);
|
||||
if (!SB)
|
||||
return nullptr;
|
||||
memset(const_cast<char*>(SB->getBufferStart()), 0, Size);
|
||||
return SB;
|
||||
}
|
||||
|
||||
ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
MemoryBuffer::getFileOrSTDIN(const Twine &Filename, int64_t FileSize,
|
||||
bool RequiresNullTerminator) {
|
||||
SmallString<256> NameBuf;
|
||||
StringRef NameRef = Filename.toStringRef(NameBuf);
|
||||
|
||||
if (NameRef == "-")
|
||||
return getSTDIN();
|
||||
return getFile(Filename, FileSize, RequiresNullTerminator);
|
||||
}
|
||||
|
||||
ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
MemoryBuffer::getFileSlice(const Twine &FilePath, uint64_t MapSize,
|
||||
uint64_t Offset) {
|
||||
return getFileAux(FilePath, -1, MapSize, Offset, false, false);
|
||||
}
|
||||
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// MemoryBuffer::getFile implementation.
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
namespace {
|
||||
/// \brief Memory maps a file descriptor using sys::fs::mapped_file_region.
|
||||
///
|
||||
/// This handles converting the offset into a legal offset on the platform.
|
||||
class MemoryBufferMMapFile : public MemoryBuffer {
|
||||
sys::fs::mapped_file_region MFR;
|
||||
|
||||
static uint64_t getLegalMapOffset(uint64_t Offset) {
|
||||
return Offset & ~(sys::fs::mapped_file_region::alignment() - 1);
|
||||
}
|
||||
|
||||
static uint64_t getLegalMapSize(uint64_t Len, uint64_t Offset) {
|
||||
return Len + (Offset - getLegalMapOffset(Offset));
|
||||
}
|
||||
|
||||
const char *getStart(uint64_t Len, uint64_t Offset) {
|
||||
return MFR.const_data() + (Offset - getLegalMapOffset(Offset));
|
||||
}
|
||||
|
||||
public:
|
||||
MemoryBufferMMapFile(bool RequiresNullTerminator, int FD, uint64_t Len,
|
||||
uint64_t Offset, std::error_code &EC)
|
||||
: MFR(FD, sys::fs::mapped_file_region::readonly,
|
||||
getLegalMapSize(Len, Offset), getLegalMapOffset(Offset), EC) {
|
||||
if (!EC) {
|
||||
const char *Start = getStart(Len, Offset);
|
||||
init(Start, Start + Len, RequiresNullTerminator);
|
||||
}
|
||||
}
|
||||
|
||||
/// Disable sized deallocation for MemoryBufferMMapFile, because it has
|
||||
/// tail-allocated data.
|
||||
void operator delete(void *p) { ::operator delete(p); }
|
||||
|
||||
StringRef getBufferIdentifier() const override {
|
||||
// The name is stored after the class itself.
|
||||
return StringRef(reinterpret_cast<const char *>(this + 1));
|
||||
}
|
||||
|
||||
BufferKind getBufferKind() const override {
|
||||
return MemoryBuffer_MMap;
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
static ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
getMemoryBufferForStream(int FD, const Twine &BufferName) {
|
||||
const ssize_t ChunkSize = 4096*4;
|
||||
SmallString<ChunkSize> Buffer;
|
||||
ssize_t ReadBytes;
|
||||
// Read into Buffer until we hit EOF.
|
||||
do {
|
||||
Buffer.reserve(Buffer.size() + ChunkSize);
|
||||
ReadBytes = read(FD, Buffer.end(), ChunkSize);
|
||||
if (ReadBytes == -1) {
|
||||
if (errno == EINTR) continue;
|
||||
return std::error_code(errno, std::generic_category());
|
||||
}
|
||||
Buffer.set_size(Buffer.size() + ReadBytes);
|
||||
} while (ReadBytes != 0);
|
||||
|
||||
return MemoryBuffer::getMemBufferCopy(Buffer, BufferName);
|
||||
}
|
||||
|
||||
|
||||
ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
MemoryBuffer::getFile(const Twine &Filename, int64_t FileSize,
|
||||
bool RequiresNullTerminator, bool IsVolatileSize) {
|
||||
return getFileAux(Filename, FileSize, FileSize, 0,
|
||||
RequiresNullTerminator, IsVolatileSize);
|
||||
}
|
||||
|
||||
static ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
getOpenFileImpl(int FD, const Twine &Filename, uint64_t FileSize,
|
||||
uint64_t MapSize, int64_t Offset, bool RequiresNullTerminator,
|
||||
bool IsVolatileSize);
|
||||
|
||||
static ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
getFileAux(const Twine &Filename, int64_t FileSize, uint64_t MapSize,
|
||||
uint64_t Offset, bool RequiresNullTerminator, bool IsVolatileSize) {
|
||||
int FD;
|
||||
std::error_code EC = sys::fs::openFileForRead(Filename, FD);
|
||||
if (EC)
|
||||
return EC;
|
||||
|
||||
ErrorOr<std::unique_ptr<MemoryBuffer>> Ret =
|
||||
getOpenFileImpl(FD, Filename, FileSize, MapSize, Offset,
|
||||
RequiresNullTerminator, IsVolatileSize);
|
||||
close(FD);
|
||||
return Ret;
|
||||
}
|
||||
|
||||
static bool shouldUseMmap(int FD,
|
||||
size_t FileSize,
|
||||
size_t MapSize,
|
||||
off_t Offset,
|
||||
bool RequiresNullTerminator,
|
||||
int PageSize,
|
||||
bool IsVolatileSize) {
|
||||
// mmap may leave the buffer without null terminator if the file size changed
|
||||
// by the time the last page is mapped in, so avoid it if the file size is
|
||||
// likely to change.
|
||||
if (IsVolatileSize)
|
||||
return false;
|
||||
|
||||
// We don't use mmap for small files because this can severely fragment our
|
||||
// address space.
|
||||
if (MapSize < 4 * 4096 || MapSize < (unsigned)PageSize)
|
||||
return false;
|
||||
|
||||
if (!RequiresNullTerminator)
|
||||
return true;
|
||||
|
||||
|
||||
// If we don't know the file size, use fstat to find out. fstat on an open
|
||||
// file descriptor is cheaper than stat on a random path.
|
||||
// FIXME: this chunk of code is duplicated, but it avoids a fstat when
|
||||
// RequiresNullTerminator = false and MapSize != -1.
|
||||
if (FileSize == size_t(-1)) {
|
||||
sys::fs::file_status Status;
|
||||
if (sys::fs::status(FD, Status))
|
||||
return false;
|
||||
FileSize = Status.getSize();
|
||||
}
|
||||
|
||||
// If we need a null terminator and the end of the map is inside the file,
|
||||
// we cannot use mmap.
|
||||
size_t End = Offset + MapSize;
|
||||
assert(End <= FileSize);
|
||||
if (End != FileSize)
|
||||
return false;
|
||||
|
||||
// Don't try to map files that are exactly a multiple of the system page size
|
||||
// if we need a null terminator.
|
||||
if ((FileSize & (PageSize -1)) == 0)
|
||||
return false;
|
||||
|
||||
#if defined(__CYGWIN__)
|
||||
// Don't try to map files that are exactly a multiple of the physical page size
|
||||
// if we need a null terminator.
|
||||
// FIXME: We should reorganize again getPageSize() on Win32.
|
||||
if ((FileSize & (4096 - 1)) == 0)
|
||||
return false;
|
||||
#endif
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
static ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
getOpenFileImpl(int FD, const Twine &Filename, uint64_t FileSize,
|
||||
uint64_t MapSize, int64_t Offset, bool RequiresNullTerminator,
|
||||
bool IsVolatileSize) {
|
||||
static int PageSize = sys::Process::getPageSize();
|
||||
|
||||
// Default is to map the full file.
|
||||
if (MapSize == uint64_t(-1)) {
|
||||
// If we don't know the file size, use fstat to find out. fstat on an open
|
||||
// file descriptor is cheaper than stat on a random path.
|
||||
if (FileSize == uint64_t(-1)) {
|
||||
sys::fs::file_status Status;
|
||||
std::error_code EC = sys::fs::status(FD, Status);
|
||||
if (EC)
|
||||
return EC;
|
||||
|
||||
// If this not a file or a block device (e.g. it's a named pipe
|
||||
// or character device), we can't trust the size. Create the memory
|
||||
// buffer by copying off the stream.
|
||||
sys::fs::file_type Type = Status.type();
|
||||
if (Type != sys::fs::file_type::regular_file &&
|
||||
Type != sys::fs::file_type::block_file)
|
||||
return getMemoryBufferForStream(FD, Filename);
|
||||
|
||||
FileSize = Status.getSize();
|
||||
}
|
||||
MapSize = FileSize;
|
||||
}
|
||||
|
||||
if (shouldUseMmap(FD, FileSize, MapSize, Offset, RequiresNullTerminator,
|
||||
PageSize, IsVolatileSize)) {
|
||||
std::error_code EC;
|
||||
std::unique_ptr<MemoryBuffer> Result(
|
||||
new (NamedBufferAlloc(Filename))
|
||||
MemoryBufferMMapFile(RequiresNullTerminator, FD, MapSize, Offset, EC));
|
||||
if (!EC)
|
||||
return std::move(Result);
|
||||
}
|
||||
|
||||
std::unique_ptr<MemoryBuffer> Buf =
|
||||
MemoryBuffer::getNewUninitMemBuffer(MapSize, Filename);
|
||||
if (!Buf) {
|
||||
// Failed to create a buffer. The only way it can fail is if
|
||||
// new(std::nothrow) returns 0.
|
||||
return make_error_code(errc::not_enough_memory);
|
||||
}
|
||||
|
||||
char *BufPtr = const_cast<char *>(Buf->getBufferStart());
|
||||
|
||||
size_t BytesLeft = MapSize;
|
||||
#ifndef HAVE_PREAD
|
||||
if (lseek(FD, Offset, SEEK_SET) == -1)
|
||||
return std::error_code(errno, std::generic_category());
|
||||
#endif
|
||||
|
||||
while (BytesLeft) {
|
||||
#ifdef HAVE_PREAD
|
||||
ssize_t NumRead = ::pread(FD, BufPtr, BytesLeft, MapSize-BytesLeft+Offset);
|
||||
#else
|
||||
ssize_t NumRead = ::read(FD, BufPtr, BytesLeft);
|
||||
#endif
|
||||
if (NumRead == -1) {
|
||||
if (errno == EINTR)
|
||||
continue;
|
||||
// Error while reading.
|
||||
return std::error_code(errno, std::generic_category());
|
||||
}
|
||||
if (NumRead == 0) {
|
||||
memset(BufPtr, 0, BytesLeft); // zero-initialize rest of the buffer.
|
||||
break;
|
||||
}
|
||||
BytesLeft -= NumRead;
|
||||
BufPtr += NumRead;
|
||||
}
|
||||
|
||||
return std::move(Buf);
|
||||
}
|
||||
|
||||
ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
MemoryBuffer::getOpenFile(int FD, const Twine &Filename, uint64_t FileSize,
|
||||
bool RequiresNullTerminator, bool IsVolatileSize) {
|
||||
return getOpenFileImpl(FD, Filename, FileSize, FileSize, 0,
|
||||
RequiresNullTerminator, IsVolatileSize);
|
||||
}
|
||||
|
||||
ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
MemoryBuffer::getOpenFileSlice(int FD, const Twine &Filename, uint64_t MapSize,
|
||||
int64_t Offset) {
|
||||
assert(MapSize != uint64_t(-1));
|
||||
return getOpenFileImpl(FD, Filename, -1, MapSize, Offset, false,
|
||||
/*IsVolatileSize*/ false);
|
||||
}
|
||||
|
||||
ErrorOr<std::unique_ptr<MemoryBuffer>> MemoryBuffer::getSTDIN() {
|
||||
// Read in all of the data from stdin, we cannot mmap stdin.
|
||||
//
|
||||
// FIXME: That isn't necessarily true, we should try to mmap stdin and
|
||||
// fallback if it fails.
|
||||
sys::ChangeStdinToBinary();
|
||||
|
||||
return getMemoryBufferForStream(0, "<stdin>");
|
||||
}
|
||||
|
||||
ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
MemoryBuffer::getFileAsStream(const Twine &Filename) {
|
||||
int FD;
|
||||
std::error_code EC = sys::fs::openFileForRead(Filename, FD);
|
||||
if (EC)
|
||||
return EC;
|
||||
ErrorOr<std::unique_ptr<MemoryBuffer>> Ret =
|
||||
getMemoryBufferForStream(FD, Filename);
|
||||
close(FD);
|
||||
return Ret;
|
||||
}
|
||||
|
||||
MemoryBufferRef MemoryBuffer::getMemBufferRef() const {
|
||||
StringRef Data = getBuffer();
|
||||
StringRef Identifier = getBufferIdentifier();
|
||||
return MemoryBufferRef(Data, Identifier);
|
||||
}
|
||||
//===--- MemoryBuffer.cpp - Memory Buffer implementation ------------------===//
|
||||
//
|
||||
// The LLVM Compiler Infrastructure
|
||||
//
|
||||
// This file is distributed under the University of Illinois Open Source
|
||||
// License. See LICENSE.TXT for details.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
//
|
||||
// This file implements the MemoryBuffer interface.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
#include "llvm/Support/MemoryBuffer.h"
|
||||
#include "llvm/ADT/SmallString.h"
|
||||
#include "llvm/Config/config.h"
|
||||
#include "llvm/Support/Errc.h"
|
||||
#include "llvm/Support/Errno.h"
|
||||
#include "llvm/Support/FileSystem.h"
|
||||
#include "llvm/Support/MathExtras.h"
|
||||
#include "llvm/Support/Path.h"
|
||||
#include "llvm/Support/Process.h"
|
||||
#include "llvm/Support/Program.h"
|
||||
#include <cassert>
|
||||
#include <cerrno>
|
||||
#include <cstring>
|
||||
#include <new>
|
||||
#include <sys/types.h>
|
||||
#include <system_error>
|
||||
#if !defined(_MSC_VER) && !defined(__MINGW32__)
|
||||
#include <unistd.h>
|
||||
#else
|
||||
#include <io.h>
|
||||
#endif
|
||||
using namespace llvm;
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// MemoryBuffer implementation itself.
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
MemoryBuffer::~MemoryBuffer() { }
|
||||
|
||||
/// init - Initialize this MemoryBuffer as a reference to externally allocated
|
||||
/// memory, memory that we know is already null terminated.
|
||||
void MemoryBuffer::init(const char *BufStart, const char *BufEnd,
|
||||
bool RequiresNullTerminator) {
|
||||
assert((!RequiresNullTerminator || BufEnd[0] == 0) &&
|
||||
"Buffer is not null terminated!");
|
||||
BufferStart = BufStart;
|
||||
BufferEnd = BufEnd;
|
||||
}
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// MemoryBufferMem implementation.
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
/// CopyStringRef - Copies contents of a StringRef into a block of memory and
|
||||
/// null-terminates it.
|
||||
static void CopyStringRef(char *Memory, StringRef Data) {
|
||||
if (!Data.empty())
|
||||
memcpy(Memory, Data.data(), Data.size());
|
||||
Memory[Data.size()] = 0; // Null terminate string.
|
||||
}
|
||||
|
||||
namespace {
|
||||
struct NamedBufferAlloc {
|
||||
const Twine &Name;
|
||||
NamedBufferAlloc(const Twine &Name) : Name(Name) {}
|
||||
};
|
||||
}
|
||||
|
||||
void *operator new(size_t N, const NamedBufferAlloc &Alloc) {
|
||||
SmallString<256> NameBuf;
|
||||
StringRef NameRef = Alloc.Name.toStringRef(NameBuf);
|
||||
|
||||
char *Mem = static_cast<char *>(operator new(N + NameRef.size() + 1));
|
||||
CopyStringRef(Mem + N, NameRef);
|
||||
return Mem;
|
||||
}
|
||||
|
||||
namespace {
|
||||
/// MemoryBufferMem - Named MemoryBuffer pointing to a block of memory.
|
||||
class MemoryBufferMem : public MemoryBuffer {
|
||||
public:
|
||||
MemoryBufferMem(StringRef InputData, bool RequiresNullTerminator) {
|
||||
init(InputData.begin(), InputData.end(), RequiresNullTerminator);
|
||||
}
|
||||
|
||||
/// Disable sized deallocation for MemoryBufferMem, because it has
|
||||
/// tail-allocated data.
|
||||
void operator delete(void *p) { ::operator delete(p); }
|
||||
|
||||
StringRef getBufferIdentifier() const override {
|
||||
// The name is stored after the class itself.
|
||||
return StringRef(reinterpret_cast<const char *>(this + 1));
|
||||
}
|
||||
|
||||
BufferKind getBufferKind() const override {
|
||||
return MemoryBuffer_Malloc;
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
static ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
getFileAux(const Twine &Filename, int64_t FileSize, uint64_t MapSize,
|
||||
uint64_t Offset, bool RequiresNullTerminator, bool IsVolatileSize);
|
||||
|
||||
std::unique_ptr<MemoryBuffer>
|
||||
MemoryBuffer::getMemBuffer(StringRef InputData, StringRef BufferName,
|
||||
bool RequiresNullTerminator) {
|
||||
auto *Ret = new (NamedBufferAlloc(BufferName))
|
||||
MemoryBufferMem(InputData, RequiresNullTerminator);
|
||||
return std::unique_ptr<MemoryBuffer>(Ret);
|
||||
}
|
||||
|
||||
std::unique_ptr<MemoryBuffer>
|
||||
MemoryBuffer::getMemBuffer(MemoryBufferRef Ref, bool RequiresNullTerminator) {
|
||||
return std::unique_ptr<MemoryBuffer>(getMemBuffer(
|
||||
Ref.getBuffer(), Ref.getBufferIdentifier(), RequiresNullTerminator));
|
||||
}
|
||||
|
||||
std::unique_ptr<MemoryBuffer>
|
||||
MemoryBuffer::getMemBufferCopy(StringRef InputData, const Twine &BufferName) {
|
||||
std::unique_ptr<MemoryBuffer> Buf =
|
||||
getNewUninitMemBuffer(InputData.size(), BufferName);
|
||||
if (!Buf)
|
||||
return nullptr;
|
||||
memcpy(const_cast<char*>(Buf->getBufferStart()), InputData.data(),
|
||||
InputData.size());
|
||||
return Buf;
|
||||
}
|
||||
|
||||
std::unique_ptr<MemoryBuffer>
|
||||
MemoryBuffer::getNewUninitMemBuffer(size_t Size, const Twine &BufferName) {
|
||||
// Allocate space for the MemoryBuffer, the data and the name. It is important
|
||||
// that MemoryBuffer and data are aligned so PointerIntPair works with them.
|
||||
// TODO: Is 16-byte alignment enough? We copy small object files with large
|
||||
// alignment expectations into this buffer.
|
||||
SmallString<256> NameBuf;
|
||||
StringRef NameRef = BufferName.toStringRef(NameBuf);
|
||||
size_t AlignedStringLen =
|
||||
alignTo(sizeof(MemoryBufferMem) + NameRef.size() + 1, 16);
|
||||
size_t RealLen = AlignedStringLen + Size + 1;
|
||||
char *Mem = static_cast<char*>(operator new(RealLen, std::nothrow));
|
||||
if (!Mem)
|
||||
return nullptr;
|
||||
|
||||
// The name is stored after the class itself.
|
||||
CopyStringRef(Mem + sizeof(MemoryBufferMem), NameRef);
|
||||
|
||||
// The buffer begins after the name and must be aligned.
|
||||
char *Buf = Mem + AlignedStringLen;
|
||||
Buf[Size] = 0; // Null terminate buffer.
|
||||
|
||||
auto *Ret = new (Mem) MemoryBufferMem(StringRef(Buf, Size), true);
|
||||
return std::unique_ptr<MemoryBuffer>(Ret);
|
||||
}
|
||||
|
||||
std::unique_ptr<MemoryBuffer>
|
||||
MemoryBuffer::getNewMemBuffer(size_t Size, StringRef BufferName) {
|
||||
std::unique_ptr<MemoryBuffer> SB = getNewUninitMemBuffer(Size, BufferName);
|
||||
if (!SB)
|
||||
return nullptr;
|
||||
memset(const_cast<char*>(SB->getBufferStart()), 0, Size);
|
||||
return SB;
|
||||
}
|
||||
|
||||
ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
MemoryBuffer::getFileOrSTDIN(const Twine &Filename, int64_t FileSize,
|
||||
bool RequiresNullTerminator) {
|
||||
SmallString<256> NameBuf;
|
||||
StringRef NameRef = Filename.toStringRef(NameBuf);
|
||||
|
||||
if (NameRef == "-")
|
||||
return getSTDIN();
|
||||
return getFile(Filename, FileSize, RequiresNullTerminator);
|
||||
}
|
||||
|
||||
ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
MemoryBuffer::getFileSlice(const Twine &FilePath, uint64_t MapSize,
|
||||
uint64_t Offset) {
|
||||
return getFileAux(FilePath, -1, MapSize, Offset, false, false);
|
||||
}
|
||||
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// MemoryBuffer::getFile implementation.
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
namespace {
|
||||
/// \brief Memory maps a file descriptor using sys::fs::mapped_file_region.
|
||||
///
|
||||
/// This handles converting the offset into a legal offset on the platform.
|
||||
class MemoryBufferMMapFile : public MemoryBuffer {
|
||||
sys::fs::mapped_file_region MFR;
|
||||
|
||||
static uint64_t getLegalMapOffset(uint64_t Offset) {
|
||||
return Offset & ~(sys::fs::mapped_file_region::alignment() - 1);
|
||||
}
|
||||
|
||||
static uint64_t getLegalMapSize(uint64_t Len, uint64_t Offset) {
|
||||
return Len + (Offset - getLegalMapOffset(Offset));
|
||||
}
|
||||
|
||||
const char *getStart(uint64_t Len, uint64_t Offset) {
|
||||
return MFR.const_data() + (Offset - getLegalMapOffset(Offset));
|
||||
}
|
||||
|
||||
public:
|
||||
MemoryBufferMMapFile(bool RequiresNullTerminator, int FD, uint64_t Len,
|
||||
uint64_t Offset, std::error_code &EC)
|
||||
: MFR(FD, sys::fs::mapped_file_region::readonly,
|
||||
getLegalMapSize(Len, Offset), getLegalMapOffset(Offset), EC) {
|
||||
if (!EC) {
|
||||
const char *Start = getStart(Len, Offset);
|
||||
init(Start, Start + Len, RequiresNullTerminator);
|
||||
}
|
||||
}
|
||||
|
||||
/// Disable sized deallocation for MemoryBufferMMapFile, because it has
|
||||
/// tail-allocated data.
|
||||
void operator delete(void *p) { ::operator delete(p); }
|
||||
|
||||
StringRef getBufferIdentifier() const override {
|
||||
// The name is stored after the class itself.
|
||||
return StringRef(reinterpret_cast<const char *>(this + 1));
|
||||
}
|
||||
|
||||
BufferKind getBufferKind() const override {
|
||||
return MemoryBuffer_MMap;
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
static ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
getMemoryBufferForStream(int FD, const Twine &BufferName) {
|
||||
const ssize_t ChunkSize = 4096*4;
|
||||
SmallString<ChunkSize> Buffer;
|
||||
ssize_t ReadBytes;
|
||||
// Read into Buffer until we hit EOF.
|
||||
do {
|
||||
Buffer.reserve(Buffer.size() + ChunkSize);
|
||||
ReadBytes = read(FD, Buffer.end(), ChunkSize);
|
||||
if (ReadBytes == -1) {
|
||||
if (errno == EINTR) continue;
|
||||
return std::error_code(errno, std::generic_category());
|
||||
}
|
||||
Buffer.set_size(Buffer.size() + ReadBytes);
|
||||
} while (ReadBytes != 0);
|
||||
|
||||
return MemoryBuffer::getMemBufferCopy(Buffer, BufferName);
|
||||
}
|
||||
|
||||
|
||||
ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
MemoryBuffer::getFile(const Twine &Filename, int64_t FileSize,
|
||||
bool RequiresNullTerminator, bool IsVolatileSize) {
|
||||
return getFileAux(Filename, FileSize, FileSize, 0,
|
||||
RequiresNullTerminator, IsVolatileSize);
|
||||
}
|
||||
|
||||
static ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
getOpenFileImpl(int FD, const Twine &Filename, uint64_t FileSize,
|
||||
uint64_t MapSize, int64_t Offset, bool RequiresNullTerminator,
|
||||
bool IsVolatileSize);
|
||||
|
||||
static ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
getFileAux(const Twine &Filename, int64_t FileSize, uint64_t MapSize,
|
||||
uint64_t Offset, bool RequiresNullTerminator, bool IsVolatileSize) {
|
||||
int FD;
|
||||
std::error_code EC = sys::fs::openFileForRead(Filename, FD);
|
||||
if (EC)
|
||||
return EC;
|
||||
|
||||
ErrorOr<std::unique_ptr<MemoryBuffer>> Ret =
|
||||
getOpenFileImpl(FD, Filename, FileSize, MapSize, Offset,
|
||||
RequiresNullTerminator, IsVolatileSize);
|
||||
close(FD);
|
||||
return Ret;
|
||||
}
|
||||
|
||||
static bool shouldUseMmap(int FD,
|
||||
size_t FileSize,
|
||||
size_t MapSize,
|
||||
off_t Offset,
|
||||
bool RequiresNullTerminator,
|
||||
int PageSize,
|
||||
bool IsVolatileSize) {
|
||||
// mmap may leave the buffer without null terminator if the file size changed
|
||||
// by the time the last page is mapped in, so avoid it if the file size is
|
||||
// likely to change.
|
||||
if (IsVolatileSize)
|
||||
return false;
|
||||
|
||||
// We don't use mmap for small files because this can severely fragment our
|
||||
// address space.
|
||||
if (MapSize < 4 * 4096 || MapSize < (unsigned)PageSize)
|
||||
return false;
|
||||
|
||||
if (!RequiresNullTerminator)
|
||||
return true;
|
||||
|
||||
|
||||
// If we don't know the file size, use fstat to find out. fstat on an open
|
||||
// file descriptor is cheaper than stat on a random path.
|
||||
// FIXME: this chunk of code is duplicated, but it avoids a fstat when
|
||||
// RequiresNullTerminator = false and MapSize != -1.
|
||||
if (FileSize == size_t(-1)) {
|
||||
sys::fs::file_status Status;
|
||||
if (sys::fs::status(FD, Status))
|
||||
return false;
|
||||
FileSize = Status.getSize();
|
||||
}
|
||||
|
||||
// If we need a null terminator and the end of the map is inside the file,
|
||||
// we cannot use mmap.
|
||||
size_t End = Offset + MapSize;
|
||||
assert(End <= FileSize);
|
||||
if (End != FileSize)
|
||||
return false;
|
||||
|
||||
// Don't try to map files that are exactly a multiple of the system page size
|
||||
// if we need a null terminator.
|
||||
if ((FileSize & (PageSize -1)) == 0)
|
||||
return false;
|
||||
|
||||
#if defined(__CYGWIN__)
|
||||
// Don't try to map files that are exactly a multiple of the physical page size
|
||||
// if we need a null terminator.
|
||||
// FIXME: We should reorganize again getPageSize() on Win32.
|
||||
if ((FileSize & (4096 - 1)) == 0)
|
||||
return false;
|
||||
#endif
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
static ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
getOpenFileImpl(int FD, const Twine &Filename, uint64_t FileSize,
|
||||
uint64_t MapSize, int64_t Offset, bool RequiresNullTerminator,
|
||||
bool IsVolatileSize) {
|
||||
static int PageSize = sys::Process::getPageSize();
|
||||
|
||||
// Default is to map the full file.
|
||||
if (MapSize == uint64_t(-1)) {
|
||||
// If we don't know the file size, use fstat to find out. fstat on an open
|
||||
// file descriptor is cheaper than stat on a random path.
|
||||
if (FileSize == uint64_t(-1)) {
|
||||
sys::fs::file_status Status;
|
||||
std::error_code EC = sys::fs::status(FD, Status);
|
||||
if (EC)
|
||||
return EC;
|
||||
|
||||
// If this not a file or a block device (e.g. it's a named pipe
|
||||
// or character device), we can't trust the size. Create the memory
|
||||
// buffer by copying off the stream.
|
||||
sys::fs::file_type Type = Status.type();
|
||||
if (Type != sys::fs::file_type::regular_file &&
|
||||
Type != sys::fs::file_type::block_file)
|
||||
return getMemoryBufferForStream(FD, Filename);
|
||||
|
||||
FileSize = Status.getSize();
|
||||
}
|
||||
MapSize = FileSize;
|
||||
}
|
||||
|
||||
if (shouldUseMmap(FD, FileSize, MapSize, Offset, RequiresNullTerminator,
|
||||
PageSize, IsVolatileSize)) {
|
||||
std::error_code EC;
|
||||
std::unique_ptr<MemoryBuffer> Result(
|
||||
new (NamedBufferAlloc(Filename))
|
||||
MemoryBufferMMapFile(RequiresNullTerminator, FD, MapSize, Offset, EC));
|
||||
if (!EC)
|
||||
return std::move(Result);
|
||||
}
|
||||
|
||||
std::unique_ptr<MemoryBuffer> Buf =
|
||||
MemoryBuffer::getNewUninitMemBuffer(MapSize, Filename);
|
||||
if (!Buf) {
|
||||
// Failed to create a buffer. The only way it can fail is if
|
||||
// new(std::nothrow) returns 0.
|
||||
return make_error_code(errc::not_enough_memory);
|
||||
}
|
||||
|
||||
char *BufPtr = const_cast<char *>(Buf->getBufferStart());
|
||||
|
||||
size_t BytesLeft = MapSize;
|
||||
#ifndef HAVE_PREAD
|
||||
if (lseek(FD, Offset, SEEK_SET) == -1)
|
||||
return std::error_code(errno, std::generic_category());
|
||||
#endif
|
||||
|
||||
while (BytesLeft) {
|
||||
#ifdef HAVE_PREAD
|
||||
ssize_t NumRead = ::pread(FD, BufPtr, BytesLeft, MapSize-BytesLeft+Offset);
|
||||
#else
|
||||
ssize_t NumRead = ::read(FD, BufPtr, BytesLeft);
|
||||
#endif
|
||||
if (NumRead == -1) {
|
||||
if (errno == EINTR)
|
||||
continue;
|
||||
// Error while reading.
|
||||
return std::error_code(errno, std::generic_category());
|
||||
}
|
||||
if (NumRead == 0) {
|
||||
memset(BufPtr, 0, BytesLeft); // zero-initialize rest of the buffer.
|
||||
break;
|
||||
}
|
||||
BytesLeft -= NumRead;
|
||||
BufPtr += NumRead;
|
||||
}
|
||||
|
||||
return std::move(Buf);
|
||||
}
|
||||
|
||||
ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
MemoryBuffer::getOpenFile(int FD, const Twine &Filename, uint64_t FileSize,
|
||||
bool RequiresNullTerminator, bool IsVolatileSize) {
|
||||
return getOpenFileImpl(FD, Filename, FileSize, FileSize, 0,
|
||||
RequiresNullTerminator, IsVolatileSize);
|
||||
}
|
||||
|
||||
ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
MemoryBuffer::getOpenFileSlice(int FD, const Twine &Filename, uint64_t MapSize,
|
||||
int64_t Offset) {
|
||||
assert(MapSize != uint64_t(-1));
|
||||
return getOpenFileImpl(FD, Filename, -1, MapSize, Offset, false,
|
||||
/*IsVolatileSize*/ false);
|
||||
}
|
||||
|
||||
ErrorOr<std::unique_ptr<MemoryBuffer>> MemoryBuffer::getSTDIN() {
|
||||
// Read in all of the data from stdin, we cannot mmap stdin.
|
||||
//
|
||||
// FIXME: That isn't necessarily true, we should try to mmap stdin and
|
||||
// fallback if it fails.
|
||||
sys::ChangeStdinToBinary();
|
||||
|
||||
return getMemoryBufferForStream(0, "<stdin>");
|
||||
}
|
||||
|
||||
ErrorOr<std::unique_ptr<MemoryBuffer>>
|
||||
MemoryBuffer::getFileAsStream(const Twine &Filename) {
|
||||
int FD;
|
||||
std::error_code EC = sys::fs::openFileForRead(Filename, FD);
|
||||
if (EC)
|
||||
return EC;
|
||||
ErrorOr<std::unique_ptr<MemoryBuffer>> Ret =
|
||||
getMemoryBufferForStream(FD, Filename);
|
||||
close(FD);
|
||||
return Ret;
|
||||
}
|
||||
|
||||
MemoryBufferRef MemoryBuffer::getMemBufferRef() const {
|
||||
StringRef Data = getBuffer();
|
||||
StringRef Identifier = getBufferIdentifier();
|
||||
return MemoryBufferRef(Data, Identifier);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue